Psilota xanthostoma Young sp. nov. (Species plate: Fig. 38; Map: Fig. 66A) Diagnosis: Face and gena entirely yellowish-orange, frons black. Fore and mid legs entirely yellowish-orange. Thorax black. Abdomen orangeish-brown. Hind leg simple. Body length: 5.1 mm. Description: MALE: unknown. FEMALE: Head: Vertex frons and occiput black, face and gena yellowish-orange. Head shining, free of pollinosity. Face and eye sparsely yellow pilose. Vertex yellow pilose. Antenna entirely yellowish-orange. Thorax: Thorax black, shining, pollinosity free. Fore and mid leg entirely yellowish-orange. Hind femur and tibia orangeishbrown, hind tarsomeres yellow. Hind femur unmodified, with only a few weak, black setulae apicoventrally. Thorax entirely yellow pilose. Halter yellow. Calypter pale. Wing colourless, entirely microtrichose. Abdomen: Abdominal sclerites orangeish-brown. Tergites white pilose. Sternites white pilose. Sternite 1 pollinose. Etymology: The specific epithet ‘ xanthostoma ’ consists of xantho, derived from the Latin “xanthous”, meaning “yellow”, and stoma, meaning “hole”, or mouth. This is in reference to the yellow face, gena, and “mouth” area of P. xanthostoma sp. nov. Specimens examined: HOLOTYPE: AUSTRALIA: Queensland: Carnarvon National Park, Mount Moffatt summit, 1097m, - 25.059722S 148.043889E, 29.xi.1997, J. Skevington and C. Lambkin, T221267 (1♀, QM). Discussion: This species is known from a single female specimen, collected on Mt. Moffat in Carnarvon National park, Queensland. Although no male has been collected, a fragment of the DNA barcode was successfully obtained from the holotype, so if a male is collected in the future it can be confidently matched to the holotype using DNA evidence. The barcode data extracted from the holotype is publicly available on the BOLD website (Process ID: SYRAU381-18), as detailed above in the Materials and methods section.

Published as part of Young, Andrew D., Skevington, Jeffrey H. & Steenis, Wouter Van, 2020, Revision of the Psilota Meigen, 1822 flower flies (Diptera: Syrphidae) of Australia, pp. 1-127 in Zootaxa 4737 (1) on pages 92-94, DOI: 10.11646/zootaxa.4737.1.1, http://zenodo.org/record/3669490